Malicious PDF — malware analysis report

Static analysis result for SHA-256 341e9ff5768d39d6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 22:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a36ab036d4d1e56be8b2685723bc430f SHA-1: b9bfb95b54f9340ced7c51fbd42bfecb19659bdd SHA-256: 341e9ff5768d39d6bccb429111e61cea17500912f1c76ae8c768edc3347404ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of many external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://premium-h.info/files/files/26511216655.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073221fd7977---wamanovis.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/620f59344b5cb74a84fc46c3f80bfeef/sekizowejuvaro.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59d382d9c---gatukawasitifewexilari.pdfIn PDF document text
    • http://caythuocnam.org/images/files/tifejisofosolosamezofaf.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/mefaraxolew.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/xofibugi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e60d887ed740241f68852c15f0fcd570/tafodipiguk.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/pejilegalev.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61213723158.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/459oh410iia7enjht1peo19hmv/tagewulonikibovufogez.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/27555747696.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/29122572497.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c57edcb8---lugifovovotixu.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/48928119726.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/80905601857.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160771e7383c58---62559021591.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1a65b6b38d90090082e2bb0d6093fba8/88396340484.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/nubonovaxu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ac4d4108---venog.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160920b0c86900---nezaxozodoxolob.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf0c22ae4---belakirevubiziwagofo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/65160d706d921293ac592e43fafddfed/10691398309.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/29849774843.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/16050560154.pdfIn PDF document text
    • https://ferropula.hr/files/belalagawan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=garp+operational+risk+management+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 10972 bytes
SHA-256: 4e6effd8b01cff389579d7bd07dec3b6dc143ef31d1ccdf9885573b3f8f14fee
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 19496 bytes
SHA-256: 9ed37859a8b3f0605dbb38669014ad90856f4b0a8df939e5ecd10a2537253860

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